熔盐电解法制备医用Mg-Ca-Zn-Li合金及机理研究

Study on Co-electrodeposition and Mechanism of Mg-Ca-Zn-Li Medicine Alloy in Molten Salt

在673 K和773 K采用惰性金属电极,应用多种电化学测试方法研究了Zn(Ⅱ)、Mg(Ⅱ)、Ca(Ⅱ)和Li(Ⅰ)离子在LiCl–KCl熔盐中的电化学行为.结果表明:当阴极电位达到-1. 40 V(vs. Ag/AgCl)时,Mg(Ⅱ)离子在先沉积的Zn表面发生反应,生成MgxZny金属间化合物,而Ca(Ⅱ)离子和Li(Ⅰ)离子同样在金属Mg表面发生欠电位沉积现象.当阴极电位达到-2. 5V(vs. Ag/AgCl)或电流达到-1. 27 A/cm^2时,熔盐共电沉积可以制备Mg-Ca-Zn-Li合金.

In this paper,the electrochemical behavior of Zn（ Ⅱ）,Mg（ Ⅱ）,Ca（ Ⅱ） and Li（ Ⅰ） ions were investigated in LiCl-KCl-CaCl2– MgCl2– ZnCl2 molten salt at 673 K or 773 K. The results showed that the redox potential of Mg（ Ⅱ）/Mg at an Zn electrode were observed at the more positive potentials values（ 1. 40 V vs. Ag/AgCl） than that at an inert electrode,the same phenomenon of Ca（ Ⅱ）and Li（ Ⅰ） ions were observed. This potential shift was due to the formation of intermetallic compound with activity electrode. The electrochemical codeposition of Mg,Ca,Zn and Li metal occurred could be gained at an applied potential more negative than -2. 5 V vs. Ag/AgCl or at current lower than -1. 27 A/cm-2.